Time-limit circuit-closer.



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C represents the casing of the circuit- -closer, which is formed intwo cup-sha ed narran sfrnrns miran"fr onirica.

WALTERW. BROWN, OF SOHENECTAD-Y, NEW YORK, ASSIGNOR TO GENERAL ELECTRI(` COMPANY, CORPORATION OF NEW YORK.

y aipecificatioin of Lettere Patent.

Patented .nily 7, 190s.

I appresa@ nea December 2s, 19er.` serial no. 408,175.

To all whom 'it may concerm Be it known that I, WALTER W. BRowN, a citizen. of the United States, residing at Schenectad county of Schenectady, State of New -Yor have invented. certain new and useful Im rovements inTime-Limit Circuit- Olosers, o which the following is a specification.

, My invention relates .to circuit-closers of the mercury't pe, and is particularly applicable to timeimitcireuit-closersfor use in connection with controlling a paratus for railway ap liances, as descrlbe 1n an application for etters Patent, Serial No. 400,646, filed by H. C. Williams and F. B.' Harrington, November 4, 1907, assignors to the General Electric Com any, although my invention is not necessari ylimited to this particular application.

.My invention consists of a novel construction ofthe circuit-closer, such that both flexible leads and sliding contacts are avoided,

and that the circuit closer is not only com-. pTletely inclosed to 1protect it from injuryl om outside,but is o so su ported as to be protected from fracture by t e movement of the mercury within the circuit closer.

My invention will best be understood by reference to the accompanying drawings, in which f Figure 1 shows a frontv elevation, partly in cross-section, of a circuit-closer constructed in accordance with my invention, and Fig. 2 Shows aside elevation of the same.

In the drawing, A represents a sup orting glate or base, on which is mounted a racket which is insulated from the plateA by metallic sections insulated from each ot er by a ring c of insulatin material, and clamped toglether b insu ated screws or bolts c1. T e metalic sections and insulatedring form together a completely closed casing terna inju The casin mountedl inlgearingsformey by the base A and bracket B, respectively.

D represents a vessel of glass4 or other suitable insulating material, which, as indicated in Fig. 1, is secured within thecasingl O by cement, which serves both to support the glass vessel and to lprotect it from fracture protecting the circuit closer from eX- .is rotatably' from internal impact due to the quick movement of the mercury from one 'end of the 'glass vessel to the other. This vessel D comprises two chambers connected by a large openingd and avrestricted opening d', and contains a quantity of mercury.

E represents circuit terminals extending into one of thechambers of the .vessel D. Vlhen the circuit-closer is in the position shown in Fig. 41, the terminals E are electrically connected by the mercury. If the circuit-closer is rotated ninety degrees in a clockwise direction, the mercu flows' through thezlarge opening 'd' into t e other chamber quickly breaking the circuit. Then if the circuit-closer is returned to its original position, the mercury slowly returns through the'restricted opening d. ment of openings a time-element is intro-V duced Ainto the operation of the circuitcloser.

The circuit terminals E are electrically By this arrange- Y connected to the two o posite sections of the metallic casin C, and. mdingposts F F 'are mounted on t e plate A and bracket B, 'respectively. With this arrangement, if the `bmding posts` are connected to the external circuit, current will flow through one bearing of the circuit-closer, and through one section of the casing toa terminal E of the circuitcloser. A similar circuit exists from the other binding post to the other terminal, so

that the device is flexible leads or col ector rings.

placed in circuit without The device may be operated in any suit- I able.v manner, as, for instance, by a pinion G attached to the casing C and a rack H con- 'l nected to the operating member J, and insulated therefrom by the `insulating plate Upon the upward or vdownward movement of the member J, the circuit-closer is rocked from one osition to the other.

What kclaim as new and desire to secure L by' Letters Patent of the VUnited States, is,'-`

1. A circuit closer,.comprisin bearings insulated from each other, a devlce journaled -in said bearings com rising a pair 'of metallic members secured to ut insulated from each other, a ring of insulating material clamped between said members and forming therewith a completely closed casing, a mass oi cement inclosed within said casing, a vessel embedded in said cement and containin 4 circuit terminals and a conducting fluid, an

connections from said terminals to said metallic members.

2. A circuit closer, comprising bearings insulated from each other, a device journaled. in said bearings comprising a pair of cupshaped metallic members, and a thin ring oi insulating material clamped between .and separating said members and forming there- Witli a completely closed casing, a mass of cement inclosed Within said easing, a vessel embedded in said cement and containing circuit 'terminals and a conducting fluid, and connections from said terminals to said metallic members. A

3. A circuit closer, comprising bearings insulated 'from each other, a device journaled in said bearings comprising a pair of metallic members secured to but insulated from each other, -a ring of insulating material clamped 20.

between said members and forming there- Witli a completely closed casing, a mass of cement inclosed Within said casing, a Vessel embedded in said cement and containing circuit terminals and a conducting Huid, connections from said terminals to said metallic .members7 and terminal binding posts secured to tlie bearing members.

4. A. time-limit circuit-closer, comprising bearings insulated 'from each other, a metal lie casing formed in sections insulated 'from each other, a VesselI containing a conducting fluid and having two chambers connected by a lar e and a restricted opening, circuit termina s in one of said chambers, and connections 'rom said terminals to the sections oi said casing.

5. A time-limit circuit-closer, comprising a rotatably mounted metallic casing, a vessel embedded in cement Within said easing containing a eonducting fluid and having two chambers connected, by a large and4 a restricted opening, and circuit terminals in one of said cliambers.

ln Witness whereof7 l have hereunto set my hand this 23rd day of December, 1907.

WALTER W. BRUWN.

Witnesses:

BENJAMIN B. HULL, HELEN @nrcan 

